Question # 1

What is the formula of talc or soapstone?

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Na2B4O7.10H2O

H2Mg3(SiO3)4

Cu2S

NaNO3

Which of the following elements is most metallic

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Bi

sb

As

P

Compared with alkaline earth metals, the alkali metals exhibit.

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lower ionization energies

greater hardness

high boiling point

smaller ionic radii

Which is not mineral of AI?

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Diaspore

Corrundam

Bauxite

Galena

Which one of the following elements is most electropositive out of group I -A and II-A group?

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K

Mg

Na

Ca

The element which exhibits maximum catenation property is

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C

Pb

Ge

Sn

_{What is name of hydrated variety of quartz?}

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Rose quartz

Smokey quartz

Silica

Opal

What is the formula of bauxite?

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Al2O3.2H2O

Al2O3

Na2B4O7 .10 H2O

Ca2B6O11. 5H2O

Which one of following property is not true about alkali metals?

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Strongest bases due to their hydrides

Low ionization energy

Oxidation number more than +1

Form acidic oxides

What is the formula of cryolite?

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Al2O3.2H2O

Na2B4O7 .10 H2O

Na3AIF6

Ca2B6O11. 5H2O

Lithium differs from rest of members of its group due to which of following reasons

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High E.N of Li+1

Small radius

High charge density

All above are correct

Soda lime is often employed to remove both

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H2O and NO2

CO2, and NO2,

H2O and CO2

H2S and CO2

Elements of group ll-A are called

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f-block elements

s-block elements

p-block elements

d-block elements

The general electronic configuration of group IV-A elements is

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ns2, np6

ns2, np4

ns2, np3

ns2, np2

The elements of group I-A react violently with water and make the solution

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neutral

amphoteric

acidic

alkaline

Beryllium differs from other elements of group Il-A due to

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high charge density

comparatively high nuclear charge

small radius

all above

Which compound gives carbon when heated with conc. H2SO4.

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Starch

Ethyl alcohol

Oxalic acid

Formic acid

Formula of sodium beryllite is

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Na2B4O7

Na2BeO2

BeONa

Na2B4O7 .10 H2O

Which of the following does not give flame test?

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Li

Ba

Mg

Sr

Which pair of following pair is metalloid?

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Antimony and bismuth

Phosphorous and arsenic

Nitrogen and phosphorous

Arsenic and antimony

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